diff --git a/flink-kubernetes-operator/src/main/java/org/apache/flink/kubernetes/operator/controller/bluegreen/BlueGreenDeploymentService.java b/flink-kubernetes-operator/src/main/java/org/apache/flink/kubernetes/operator/controller/bluegreen/BlueGreenDeploymentService.java
index 6274881df2..ad6f0d9bfa 100644
--- a/flink-kubernetes-operator/src/main/java/org/apache/flink/kubernetes/operator/controller/bluegreen/BlueGreenDeploymentService.java
+++ b/flink-kubernetes-operator/src/main/java/org/apache/flink/kubernetes/operator/controller/bluegreen/BlueGreenDeploymentService.java
@@ -44,7 +44,9 @@
 import org.slf4j.LoggerFactory;
 
 import java.time.Instant;
+import java.util.Map;
 import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
 
 import static org.apache.flink.kubernetes.operator.controller.bluegreen.BlueGreenKubernetesService.deleteFlinkDeployment;
 import static org.apache.flink.kubernetes.operator.controller.bluegreen.BlueGreenKubernetesService.deployCluster;
@@ -58,6 +60,7 @@
 import static org.apache.flink.kubernetes.operator.utils.bluegreen.BlueGreenUtils.isSavepointRequired;
 import static org.apache.flink.kubernetes.operator.utils.bluegreen.BlueGreenUtils.millisToInstantStr;
 import static org.apache.flink.kubernetes.operator.utils.bluegreen.BlueGreenUtils.prepareFlinkDeployment;
+import static org.apache.flink.kubernetes.operator.utils.bluegreen.BlueGreenUtils.revertToLastSpec;
 import static org.apache.flink.kubernetes.operator.utils.bluegreen.BlueGreenUtils.setLastReconciledSpec;
 import static org.apache.flink.kubernetes.operator.utils.bluegreen.BlueGreenUtils.triggerSavepoint;
 
@@ -67,6 +70,15 @@ public class BlueGreenDeploymentService {
     private static final Logger LOG = LoggerFactory.getLogger(BlueGreenDeploymentService.class);
     private static final long RETRY_DELAY_MS = 500;
 
+    /**
+     * In-memory cache of the pre-transition lastReconciledSpec, keyed by namespace. Saved before
+     * setLastReconciledSpec overwrites it during a transition, restored on abort so
+     * lastReconciledSpec stays consistent with the active child. Lost on operator restart, which
+     * falls back to pre-fix behavior (no revert) — acceptable since restart during the abort window
+     * is rare and not a regression.
+     */
+    private final Map<String, String> previousReconciledSpecs = new ConcurrentHashMap<>();
+
     // ==================== Deployment Initiation Methods ====================
 
     /**
@@ -163,15 +175,13 @@ public UpdateControl<FlinkBlueGreenDeployment> checkAndInitiateDeployment(
                     }
 
                     try {
+                        // Save pre-transition lastReconciledSpec so we can restore on abort
+                        savePreTransitionSpec(context);
                         var result =
                                 startTransition(
                                         context,
                                         currentBlueGreenDeploymentType,
                                         currentFlinkDeployment);
-                        // Only stamp lastReconciledSpec after the transition
-                        // succeeds. If stamped before and the transition
-                        // fails/aborts, lastReconciledSpec drifts from the
-                        // active child's actual spec
                         setLastReconciledSpec(context);
                         return result;
                     } catch (Exception e) {
@@ -189,6 +199,8 @@ public UpdateControl<FlinkBlueGreenDeployment> checkAndInitiateDeployment(
                             context.getBgDeployment().getMetadata().getName(),
                             Objects.toString(jobSpec.getInitialSavepointPath(), "<none>"));
                     try {
+                        // Save pre-transition lastReconciledSpec so we can restore on abort
+                        savePreTransitionSpec(context);
                         var result =
                                 startSavepointRedeployTransition(
                                         context, currentBlueGreenDeploymentType);
@@ -697,6 +709,15 @@ private UpdateControl<FlinkBlueGreenDeployment> abortDeployment(
         context.getDeploymentStatus().setBlueGreenState(previousState);
         context.getDeploymentStatus().setSavepointTriggerId(null);
 
+        // Restore lastReconciledSpec and the B/G CR spec to the pre-transition state
+        // so they stay consistent with the active child that is still running.
+        String namespace = context.getBgDeployment().getMetadata().getNamespace();
+        String previousSpec = previousReconciledSpecs.remove(namespace);
+        if (previousSpec != null) {
+            context.getDeploymentStatus().setLastReconciledSpec(previousSpec);
+            revertToLastSpec(context);
+        }
+
         var error =
                 String.format(
                         "Aborting deployment '%s', rolling B/G deployment back to %s",
@@ -704,6 +725,12 @@ private UpdateControl<FlinkBlueGreenDeployment> abortDeployment(
         return markDeploymentFailing(context, error);
     }
 
+    private void savePreTransitionSpec(BlueGreenContext context) {
+        String namespace = context.getBgDeployment().getMetadata().getNamespace();
+        previousReconciledSpecs.put(
+                namespace, context.getDeploymentStatus().getLastReconciledSpec());
+    }
+
     @NotNull
     private static UpdateControl<FlinkBlueGreenDeployment> markDeploymentFailing(
             BlueGreenContext context, String error) {
@@ -744,6 +771,7 @@ public UpdateControl<FlinkBlueGreenDeployment> finalizeBlueGreenDeployment(
         context.getDeploymentStatus().setDeploymentReadyTimestamp(millisToInstantStr(0));
         context.getDeploymentStatus().setAbortTimestamp(millisToInstantStr(0));
         context.getDeploymentStatus().setSavepointTriggerId(null);
+        previousReconciledSpecs.remove(context.getBgDeployment().getMetadata().getNamespace());
 
         updateBlueGreenIngress(context, nextState);
 
diff --git a/flink-kubernetes-operator/src/test/java/org/apache/flink/kubernetes/operator/controller/FlinkBlueGreenDeploymentControllerTest.java b/flink-kubernetes-operator/src/test/java/org/apache/flink/kubernetes/operator/controller/FlinkBlueGreenDeploymentControllerTest.java
index e657bb7227..c18fafa24b 100644
--- a/flink-kubernetes-operator/src/test/java/org/apache/flink/kubernetes/operator/controller/FlinkBlueGreenDeploymentControllerTest.java
+++ b/flink-kubernetes-operator/src/test/java/org/apache/flink/kubernetes/operator/controller/FlinkBlueGreenDeploymentControllerTest.java
@@ -549,6 +549,12 @@ public void verifyFailureDuringTransition(FlinkVersion flinkVersion) throws Exce
         // savepointTriggerId must be cleared on abort so the next transition
         // triggers a fresh savepoint instead of reusing a stale triggerId
         assertNull(rs.reconciledStatus.getSavepointTriggerId());
+        // lastReconciledSpec must NOT contain the failed spec change — on abort
+        // it should be reverted to the pre-transition spec so it stays consistent
+        // with the active child that is still running
+        assertFalse(
+                rs.reconciledStatus.getLastReconciledSpec().contains(customValue),
+                "lastReconciledSpec should be reverted on abort to match the active child");
 
         // Simulate another change in the spec to trigger a redeployment
         customValue = UUID.randomUUID().toString();